Planer-chuck



(1710 Model.) 7

W. PORTER.

PLANER CHUCK.

No. 287,160. Patented Oct. 23, 1883.

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NITED STATES PATENT FFICE.

WALLACE PORTER, OF NEW HAVEN, CONNECTICUT.

'PLANERQ-CHUCK.

SPECIFICATION forming part of Letters Patent No. 287,160, dated October23, 1883.

Application filed May 26, 1883. (No model.)

T0 aZZ whom it may concern Be it known that I, WALLACE PORTER, a citizenof the United States of America, residing at New Haven, in the county ofNew Haven and State of Connecticut, have invented certain new and usefulImprovements in Planer-Chucks, of which the following is aspecification, reference being had therein to the accompanying drawings.

My inventionrelates to improvements in planer-chucks; and its object isto provide improved means for clamping the movable jaw to the base ofthe chuck.

My invention consists in the hereinafter-described means for attainingsaid object.

In the drawings, Figure 1 represents a top plan view of a pl anerchuckwith my improvement attached thereto; Fig. 2, a transverse verticalsection on line .00 m, Fig. 1; Fig. 3, a detail view of one of theclamps, with its eccentric bushing; Fig. 4, a like view of the cocentricbolt, and Fig. 5 a view of the wrench used in operating the bolts andscrews.

Similar letters of reference indicate corre sponding parts throughoutthe different views.

A represents the base of the chuck, provided with the ordinaryclamping-shoulders, a.

B is thefiXed, and Cthe movable, jaw of the chuck. Said movable jawrests and slides upon the base A, and is held against the object planedby means of the screws 0, which work through threaded bearings formed inan elevation, at, of said base A, and rest against the back of saidmovable jaw. Said jaw is secured to the base A by means of the clamps D,said clamps being pivoted to said movable jaw and extended downward andunder the shoulders a. The means for pivoting said clamps to the movablejaws, which consist, essentially, in the peculiar form of the bolts Fand the clamps provided with the eccentric bushings E, form the gist ofmyinvention. Each of said bushings E is, as has been said, eccentric inshape, and the object of this eccentricity is to allow for wear in thebearings of the bolts. In other words, the principal friction of thebolts upon the bearings is confined to certain spots. bushings, when thebearings of the bolts become worn the bushing may be turned, and

By the use of these eccentric ably greater diameter than from theireccen-' tries to their extremities. The purpose of this is to enable theend of the bolt to pass through the bearing in the aforesaid bushing E,while at the same time the part near the head is of such size as toallow for a circumferential groove, f; The purpose of said groove is toallow passage between its sides of the pin which locks the bolt to themovable jaw.

By the aforegoing construction it will be seen that when the bolts F areturned the eccentrics f will elevate the clamps D, and thus secure themovable jaws to the chuck-base.

The operation of my invention is as follows: The article to be planedhaving been placed between the j aws B C, the said jaw C is movedforward and forced against said article by means of the screws 0. Thebolts F are then turned until the eccentrics have raised the lower endsof the clamps sufficiently to fix the movable jaw firmly to the base.The planing is then proceeded with.

Having thus described my invention, what I claim is 1. In aplaner-chuck, the bolt F, provided upon its shank with eccentric f, saidbolt adapted to connect the clamp with the movable jaw, and saideccentric adapted to elevate said clamp, in the manner and for thepurpose set forth. 7

2. In a planer-chuck, the combination, with the movable jaw, the clamps,and the bolts F,

The

of the eccentric bushings E, substantially as Y and for the purposesdescribed.

In testimony whereof I affix my signature in presence of two witnesses.

WALLACE PORTER. Witnesses:

GEORGE TERRY, DANIEL S. GLENNEY, Jr.

